Quick Answer
To finish a cordwood wall, apply a lime-based plaster or a natural fiber-based render, such as clay or earth plaster, to seal the gaps between the logs and create a smooth surface. This protects the wall from the elements and enhances its aesthetic appeal. Regularly applying a breathable finish is essential.
Applying the Final Coat
When finishing a cordwood wall, apply two to three coats of a breathable, lime-based plaster or natural fiber-based render. For the first coat, use a mixture of 1 part lime putty to 1 part water, and apply it with a trowel or a brush to fill the gaps between the logs. Allow the first coat to dry completely before applying subsequent coats, following the manufacturer’s instructions for application and drying times.
Insulation and Weatherproofing
To ensure the cordwood wall is well-insulated and weatherproof, apply a natural fiber-based render, such as earth plaster, with a minimum thickness of 1/4 inch (6 mm). This will provide adequate protection against wind-driven rain and extreme temperatures. Consider adding a layer of insulation, such as wool or recycled denim, to the log ends for added thermal performance.
Techniques for Smooth Finish
To achieve a smooth finish, use a combination of techniques, including applying the plaster or render in thin layers, allowing each layer to dry before the next, and using a float or a trowel to smooth out the surface. Regularly inspect the wall for any imperfections or gaps and make repairs as necessary. This will ensure a durable and visually appealing finish that enhances the overall aesthetic of the cordwood wall.
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